Code No.P0504: Malfunction of the Stop Lamp Switch System




OPERATION




DIAGNOSIS CODE SET CONDITIONS


Check Condition
Judgement Criteria

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines.
  • Before replacing the ECU, ensure that the CAN bus lines is normal.

STEP 1. Check the CAN bus system diagnosis.


Using M.U.T.-III, perform CAN bus diagnosis (Refer to GROUP 54C - Explanation About The M.U.T.-III Can Bus Diagnostics ).

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus Diagnostic Table ). Then go to Step 12.

STEP 2. Check the data list.


Using M.U.T.-III, check the PHEV-ECU data list (Refer to GROUP 54D - data list reference table ).

  • Item No.398: Stop lamp switch for speed control

Q. Is the check result normal?

Go to Step 6.
Go to Step 3.

STEP 3. Check the stop lamp operation.


Check the stop lamp operation.
OK:

    Brake pedal depressed: Stop lamp will illuminate
    Brake pedal not depressed: Stop lamp does not illuminate

Q. Is the check result normal?

Go to Step 4.
Check the stop lamp system (Refer to GROUP 54A - Rear Combination Lamp, Symptom Procedures, Inspection Procedure 2: The stop lamps do not illuminate or go out normally ). Then go to Step 11.

STEP 4. Check the ETACS system data list.


Using M.U.T.-III, check the ETACS system data list (Refer to GROUP 54A - ETACS, Troubleshooting, data list reference table ).

  • Item 290: Stop lamp switch

Q. Is the check result normal?

Go to Step 5.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS, ETACS-ECU ). Then go to Step 11.

STEP 5. Check the data list.


Using M.U.T.-III, check the PHEV-ECU data list (Refer to GROUP 54D - data list reference table ).

  • Item No.398: Stop lamp switch for speed control

Q. Is the check result normal?

Go to Step 6.
Replace the PHEV-ECU (Refer to GROUP 54D - PHEV-ECU ). Then go to Step 11.

STEP 6. Check the data list.


Using M.U.T.-III, check the PHEV-ECU data list (Refer to GROUP 54D - data list reference table ).

  • Item No.397: Brake switch for speed control

Q. Is the check result normal?

Go to Step 10.
Go to Step 7.

STEP 7. Check the harness wire between PHEV-ECU connector terminal BRSW and stop lamp switch connector, and between stop lamp switch connector and earth.



  • Check connector or harness wire for open/short circuit and damage.

Q. Is the check result normal?

Go to Step 8.
Repair connector or damaged harness wire. Then go to Step 11.

STEP 8. Check the stop lamp switch.


Q. Is the check result normal?

Go to Step 9.
Replace the stop lamp switch (Refer to GROUP 35A - Brake Pedal ). Then go to Step 11.

STEP 9. Check the data list.


Using M.U.T.-III, check the PHEV-ECU data list (Refer to GROUP 54D - data list reference table ).

  • Item No.397: Brake switch for speed control

Q. Is the check result normal?

Go to Step 10.
Replace the PHEV-ECU (Refer to GROUP 54D - PHEV-ECU ). Then go to Step 11.

STEP 10. Read the diagnosis code.


(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
(2)Turn ON the power supply mode of the electric motor switch, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control display screen is turned on).
(3)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnosis code of the cruise control system (Refer to ).

Q. Is diagnosis code No. P0504 stored?

Replace the PHEV-ECU (Refer to GROUP 54D - PHEV-ECU ). Then go to Step 11.
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).

STEP 11. Check the data list.


Using M.U.T.-III, check the PHEV-ECU data list (Refer to GROUP 54D - data list reference table ).

  • Item No.397: Brake switch for speed control
  • Item No.398: Stop lamp switch for speed control

Q. Is the check result normal?

Go to Step 12.
Return to Step 2.

STEP 12. Read the diagnosis code.


(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
(2)Turn ON the power supply mode of the electric motor switch, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control display screen is turned on).
(3)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnosis code of the cruise control system (Refer to ).

Q. Is diagnosis code No. P0504 stored?

Return to Step 1.
The procedure is complete.